It's connected to Thermodynamics.
Fossil Fuels comparison Also included: Alternative Fuels eg. Hydrogen Fuel Cell. |
Friday 18 March 2011
Chemistry
I'm reading Energy Changes :)
H =U +pV
ΔH=Q
ΔH means enthalpy change measured in (kJ) Q is the energy added to the system through heat
Mole is also involved here, when doing calculations in equations.
Exothermic: Heat given out Endothermic: Heat absorbed
Bond energy- energy needed to break a chemical bond. (kJ)
Breaking bonds-require energy Forming new bonds gives out energy
====Do the calculations here (Calculate ΔH) =======
Activation energy:-Minimum energy that reacting particles must posses for a chemical reaction to occur.
ON TO MORE SOMETHING MORE FAMILIAR
FUELS ( I've done a report on this before -.-)
-Substance that burns in air/oxygen to produce heat energy -Exothermic Fire----Heat, Fuel, Oxygen (Take out one, no fire produced)
Good Fuel: Easy to ignite, not not easily flammable Easy Storage + Transport Little Pollution Efficient in producing heat Cheap, Abundant Safe
Sources of fuel: -Coal -Crude oil -Natural gas ( formed by heat and pressure on the remains of plants and animals millions of years ago)
Coal-mainly Carbon C + O2 ------>CO2
Natural gas-methane Excess oxygen (Methane is limiting) CH4 (g) + 2O2 (g) → C (g) + 2 H2O (l) Insufficient Oxygen ( Oxygen is limiting) 4CH4 (g) + 5O2 (g) → 2CO (g) + 8 H2O(l) + 2C (s)
Crude oil- mixture of hydrocarbons, separated by fractional distillation. Hydrocarbon with more carbon atoms has a higher boiling point that one with fewer carbon atoms. Hydrocarbon with more carbon atoms collect at the bottom.
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